need vs overflow

need

verb
  • To want strongly; to feel that one must have something. 

  • To be obliged or required (to do something). 

  • To be required; to be necessary. 

  • To have an absolute requirement for. 

noun
  • Lack of means of subsistence; poverty; indigence; destitution. 

  • A requirement for something; something needed. 

overflow

verb
  • To be superabundant; to abound. 

  • To flow over the edge of a container. 

  • To exceed limits or capacity. 

  • To (cause to) exceed the available numeric range. 

  • To cover with a liquid, literally or figuratively. 

  • To flow over the brim of (a container). 

  • To cause an overflow. 

noun
  • The situation where a value exceeds the available numeric range. 

  • The spillage resultant from overflow; excess. 

  • Outlet for escape of excess material. 

How often have the words need and overflow occurred in a corpus of books? (source: Google Ngram Viewer )